https://rocket703.github.io/evi/
Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
91
GRADE
A
FIX
1
REVIEW
6
PASS
16
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
97
97
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.20 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.36 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.112
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.20 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.36 s
Page Load Progression
375 ms
750 ms
1.1 s
1.5 s 1.9 s 2.2 s 2.6 s 3.0 sChecks
2616 PASS 6 REVIEW 1 FIX
DPage Weight BudgetAction2.3 MB transferred, 27 requestsFIX
Page Weight Budget
Action2.3 MB transferred, 27 requests
2.3 MB transferred, 27 requests
Info::
Page weighs 2.4 MB (2.3 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Info::
27 HTTP requests
Info::
Estimated 0.49 g CO2 per page load
2.3 MB transferred
27 requests
0.49 g CO2 per page load
Images 2.2 MiB 93%
Fonts 134.5 KiB 6%
HTML 19.5 KiB 1%
Other 5.6 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Why this matters
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
BJS Execution Cost950ms total JS executionREVIEW
JS Execution Cost
950ms total JS execution
950ms total JS execution
Warning::
https://rocket703.github.io/evi/: 689ms CPU time
Warning::
Unattributable: 261ms CPU time
Main Thread Breakdown
Other 42% Style & Layout 34% Rendering 14% Script Evaluation 5% Parse HTML & CSS 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://rocket703.github.io/evi/ | 689ms | 22ms | 4ms | 1st |
| Unattributable | 261ms | 19ms | 0ms | 1st |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
BDocument CompressionDocument response uses gzip; brotli would be ~20% smallerREVIEW
Document Compression
Document response uses gzip; brotli would be ~20% smaller
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
BMain HTML Cache-ControlMain HTML max-age=600 (~10min)REVIEW
Main HTML Cache-Control
Main HTML max-age=600 (~10min)
Main HTML max-age=600 (~10min)
Info::
Main HTML cached for 10 minutes -- mild staleness risk
Got: max-age=600
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
CPage Weight InventoryAction27 resources · 2.3 MB · 0 KB savings availableREVIEW
Page Weight Inventory
Action27 resources · 2.3 MB · 0 KB savings available
27 resources · 2.3 MB · 0 KB savings available
Warning::
Page weight 2.3 MB exceeds 1 MB target by 1.3 MB
Got: 2.3 MB Expected: ≤ 1 MB
Info::
4 resources over 200KB
27 resources · 2.3 MiB · 0 third-party 1.3 MiB over 1MB target
Image 94% · 2.2 MiB
Font 6% · 134.5 KiB
Document 1% · 19.5 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 27 resources | 2.3 MiB | ||||||
A+Third-Party ImpactNo third-party resourcesPASS
Third-Party Impact
No third-party resources
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Image Optimization19 images, 0 KB saveablePASS
Image Optimization
19 images, 0 KB saveable
19 images, 0 KB saveable
Info::
All images are well-optimized
19 images 2.2 MB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+Font Loading6 fonts (135 KB)PASS
Font Loading
6 fonts (135 KB)
6 fonts (135 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
135 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
roboto-latin-400-normal... woff2 swap
Size 22 KB
Load time 167 ms
Start 96 ms
Risk FOUT — text flashes from fallback to web font
roboto-latin-600-normal... woff2 swap
Size 22 KB
Load time 157 ms
Start 96 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-lati... woff2 swap
Size 24 KB
Load time 160 ms
Start 98 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-lati... woff2 swap
Size 22 KB
Load time 212 ms
Start 98 ms
Risk FOUT — text flashes from fallback to web font
roboto-latin-500-normal... woff2 swap
Size 22 KB
Load time 158 ms
Start 99 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-lati... woff2 swap
Size 24 KB
Load time 147 ms
Start 99 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
- Preload critical fonts (priority=high)
- Use woff2 format for all fonts
- Set font-display to swap, optional, or fallback
- Subset large fonts (≤100 KB each)
A+JS BundlesNo JavaScriptPASS
JS Bundles
No JavaScript
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
JavaScript Blocking
No render-blocking JS or document.write usage detected
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
CSS Performance Depth
No CSS performance depth issues detected
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Fastly
A+HTTP Cachingmax-age=600 (10 minutes)PASS
HTTP Caching
max-age=600 (10 minutes)
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control
max-age=600
| Directive | Value | Meaning |
|---|---|---|
| max-age | 600 | Cache for 10 minutes |
Effective TTL: 600 seconds
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall27 requests over 460msINFO
Network Waterfall
27 requests over 460ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization26 images, 537 KB total, 12 KB wastedINFO
Image Optimization
26 images, 537 KB total, 12 KB wasted
Image Optimization Audit
Total Images
26
Total Size
537 KB
Oversized
1
Wasted
12 KB
2 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.